SOAN 2120 Study Guide - Final Guide: Random Number Table, Descriptive Statistics, Scatter Plot

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Percentile tells the score at a specific place within the distribution (median is the 50th percentile) Standard deviation a measure of dispersion for one variable that indicates an average distance between the scores and the mean. Let a researcher consider two variables together and describe the relationship between them. Statistical relationships are based on two ideas: covariation and independence. It means there is no association or no relationship between variables. Researcher plots each case, where each axis represents the value of one variable. Used for variables measured at the interval or ratio level, rarely for ordinal variables and never if either value is nominal. A researcher can see three aspects of a bi-variate relationship in a scattergram: form, direction, precision. A system for reading percentaged trivariate tables. Showing a relationship between two variables is not sufficient enough to say that an independent variable causes a dependent variable.